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Prikladnaya Mekhanika, Vol. 3, No. 12, pp. 65–72, 1967
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Fel'dman, M.R. Natural vibrations of plates of stepwise variable thickness. Soviet Applied Mechanics 3, 44–50 (1967). https://doi.org/10.1007/BF00886231
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DOI: https://doi.org/10.1007/BF00886231